Backplane Connector: Voltage Rating 250V AC/DC

Component Specifications

Definition

A backplane connector is a critical interconnect component in modular industrial input systems, designed to establish reliable electrical connections between a main backplane PCB and multiple daughterboard PCBs. It enables simultaneous transmission of digital signals, analog inputs, and power distribution across the input module's architecture. These connectors feature precise pin alignment, robust contact systems, and shielding to maintain signal integrity in industrial environments with electromagnetic interference, vibration, and temperature variations.

Working Principle

The backplane connector operates by providing a passive interconnection matrix between PCBs. When daughterboards (input cards) are inserted into the module chassis, their edge connectors mate with corresponding contacts on the backplane connector. This creates continuous electrical pathways for data signals (using differential pairs for high-speed communication) and power rails. The connector maintains contact pressure through spring-loaded pins or compliant press-fit technology, ensuring reliable connections despite thermal expansion and mechanical stress in industrial settings.

Materials

Housing: High-temperature thermoplastic (PPS, LCP, or PEEK) rated for 125-150°C operation; Contacts: Phosphor bronze or beryllium copper with selective gold plating (0.5-1.27μm) over nickel underplate; Insulators: Glass-filled polymers for dimensional stability; Shielding: Zinc alloy or stainless steel cages with tin plating.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Pitch	1.27mm or 2.0mm
IP Rating	IP20 (board-level)
Pin Count	40-200 positions
Mating Cycles	≥500 cycles
Current Rating	1-3A per contact
Voltage Rating	250V AC/DC
Contact Resistance	<20mΩ initial
Flammability Rating	UL94 V-0
Insulation Resistance	>1000MΩ at 500VDC
Operating Temperature	-40°C to +85°C (extended to +125°C available)
Dielectric Withstanding Voltage	1000V AC for 1 minute

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60603-2, IEC 61076-4, MIL-DTL-83513

Parent Products

This component is used in the following industrial products

Input Module

A PLC component that receives and converts external sensor/switch signals into digital data for the processor.

View Product Details

PLC CPU Module

The central processing unit module of a Programmable Logic Controller that executes control programs and manages system operations.

View Product Details

Engineering Analysis

Risks & Mitigation

Signal degradation due to contact corrosion
Mechanical failure from vibration-induced fretting
Intermittent connections from thermal cycling stress
Pin damage during improper card insertion

FMEA Triads

Trigger: Contamination from industrial particulates or moisture ingress
Failure: Increased contact resistance leading to signal loss or power interruption
Mitigation: Use connectors with protective shrouds, implement regular cleaning protocols, apply conformal coating to backplane assembly

Trigger: Repeated thermal cycling causing contact spring relaxation
Failure: Loss of contact pressure resulting in intermittent connections
Mitigation: Select connectors with high-temperature rated materials, design for minimal thermal expansion mismatch, use connectors with redundant contact points

Trigger: Mechanical vibration in industrial environments
Failure: Contact fretting wear leading to increased resistance and eventual open circuit
Mitigation: Implement vibration-dampening mounting, use connectors with anti-vibration locking mechanisms, specify connectors validated for industrial vibration profiles

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Contact position tolerance: ±0.1mm; Housing dimensional tolerance: ±0.15mm per IEC 60603-2

Test Method

Electrical: Contact resistance per MIL-STD-1344; Mechanical: Insertion/extraction force per IEC 60512; Environmental: Thermal cycling per IEC 60068-2-14, vibration per IEC 60068-2-6

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Backplane Connector

Manufacturer profiles associated with Backplane Connector.

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Frequently Asked Questions

What is the difference between a backplane connector and a regular board-to-board connector?

Backplane connectors are designed for connecting multiple daughterboards to a single backplane simultaneously, featuring higher pin counts, better alignment guides, and enhanced durability for frequent card insertion/removal. Regular board-to-board connectors typically connect just two PCBs and may have lower cycle life ratings.

How do I select the right backplane connector for my industrial input module?

Consider these factors: required signal count and types (digital/analog/power), operating environment (temperature, vibration, contaminants), mating cycle requirements, compliance with industry standards (IEC, UL), and compatibility with existing module architecture. Consult manufacturer datasheets for environmental ratings and validation test results.

What maintenance do backplane connectors require in industrial applications?

Regular inspection for contamination (clean with approved solvents if needed), verification of contact integrity through periodic electrical testing, and ensuring proper seating of daughterboards. Avoid excessive insertion/removal cycles beyond rated specifications. In harsh environments, consider protective covers when slots are unused.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Backplane Connector